could scull
Regular verb: scull - sculled- sculled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scull
you could scull
he could scull
we could scull
you could scull
they could scull 	I could be sculling
you could be sculling
he could be sculling
we could be sculling
you could be sculling
they could be sculling	I could have sculled
you could have sculled
he could have sculled
we could have sculled
you could have sculled
they could have sculled	I could have been sculling
you could have been sculling
he could have been sculling
we could have been sculling
you could have been sculling
they could have been sculling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't scull
you couldn't scull
he couldn't scull
we couldn't scull
you couldn't scull
they couldn't scull 	I couldn't be sculling
you couldn't be sculling
he couldn't be sculling
we couldn't be sculling
you couldn't be sculling
they couldn't be sculling	I couldn't have sculled
you couldn't have sculled
he couldn't have sculled
we couldn't have sculled
you couldn't have sculled
they couldn't have sculled	I couldn't have been sculling
you couldn't have been sculling
he couldn't have been sculling
we couldn't have been sculling
you couldn't have been sculling
they couldn't have been sculling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scull?
could you scull?
could he scull?
could we scull?
could you scull?
could they scull? 	could I be sculling?
could you be sculling?
could he be sculling?
could we be sculling?
could you be sculling?
could they be sculling? 	could I have sculled?
could you have sculled?
could he have sculled?
could we have sculled?
could you have sculled?
could they have sculled? 	could I have been sculling?
could you have been sculling?
could he have been sculling?
could we have been sculling?
could you have been sculling?
could they have been sculling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I scull?
couldn't you scull?
couldn't he scull?
couldn't we scull?
couldn't you scull?
couldn't they scull? 	couldn't I be sculling?
couldn't you be sculling?
couldn't he be sculling?
couldn't we be sculling?
couldn't you be sculling?
couldn't they be sculling? 	couldn't I have sculled?
couldn't you have sculled?
couldn't he have sculled?
couldn't we have sculled?
couldn't you have sculled?
couldn't they have sculled? 	couldn't I have been sculling?
couldn't you have been sculling?
couldn't he have been sculling?
couldn't we have been sculling?
couldn't you have been sculling?
couldn't they have been sculling?